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USB CABLE

Discussion in 'Electronic Design' started by [email protected], Nov 20, 2006.

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  1. Guest

    HIYA ALL I NEED TO FIND SOME ONE THAT CAN BUILD A 15MTR USB TO USB
    CABLE CAN ANY ONE HELP?
     
  2. Don McKenzie

    Don McKenzie Guest

    USB is only good (reliable) for 5 meters.

    I have two 10 meter cables I purchased to play around with when USB was
    first introduced. Neither of them work.

    They are extension cables, so they will plug together and give you 20
    meters of male to female cable that doesn't work.

    But if you are interested, I can think of a price plus postage, and my
    problem will become your problem. :)

    Unless you know something I don't.

    Don...



    --
    Don McKenzie
    E-Mail Contact Page: http://www.dontronics.com/e-mail.html

    Crystal clear, super bright OLED LCD (128x128) for your microcontroller.
    Simple serial RX/TX interface. Many memory sizes.
    http://www.dontronics-shop.com/product.php?productid=16460
     
  3. Arlet

    Arlet Guest

    It is not possible to make a 15 mtr USB standard compliant cable, due
    to one-way propagation delay limit of 26 ns (see section 7.1.16 of USB
    2.0 standard)

    It is of course possible to make a 15 mtr cable with USB plugs on it,
    but there will be no guarantee that it works, and you can't legally put
    the USB logo on it.
     
  4. Scruffy

    Scruffy Guest


    What about "USB Active Extension Cables"? Supposedly cascadable 5 x 5m -->
    25m
    Personally I've never seen or used one.
     
  5. Arlet

    Arlet Guest

    As long as they have a real hub inside, they should work fine. Since
    these are bus powered, they'll eat some of the 500 mA budget, which
    might be a problem in some applications.

    Also, the USB spec allows up to 7 tiers, one of which is the root , and
    the other is the device itself, allowing a maximum of 5 hubs to be
    chained inbetween, including any hubs already implemented inside the PC
    itself.
     
  6. If it's not commercial try experimenting with some DC-DC converters and
    high speed opto couplers - pump up the voltages to stop leakage - much
    like the transmission of mains power. At the other end do the opposite
    to get back to your standard USB levels.
    Oh yes and before you go and blame me - I've never tried this so it
    could wreck anything attached - test THOROUGHLY.
     
  7. Spajky

    Spajky Guest

  8. Spajky

    Spajky Guest

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